move Allocator to include, properly namespaced
move Slice out of object-writer, to be more general
move fixed allocator out of machine.h
use Slice<uint8_t> in FixedAllocator
use Slice in Vector
use size_t for Vector::minimumCapacity
add Slice::resize and Slice::alloc
fix arm/powerpc build
build arm and powerpc targets in the ci build
Merge pull request #180 from joshuawarner32/move-allocator

Move allocator & Slice into util